Fluid-meter.



. H. s. DOLBEYL FLUID METER.

APPLICATION FILED JUNE 18, I914. 1,,146A09a Patented July 13, 1915.

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H. S: DOLBEY.

FLU!D METER APPLICATION FILED JUNE 18, I914. fi f figmfi Patented July 13, 1915.

2 SHEETS-SHEET 2- i ,idGAOQ.

tin'rrnn sra'rns rad an-m HARRY S. DOLBEY, 0F PROVIDENCE, RHODE ISLAND, ASSIGNORTO BUILDERS IRON FOUNDRY, OF PROVIDENCE, RHODE ISLAND, A CORPORATION OF RHODE ISLAND.

FLUID-METER.

Specification of Letters Patent.

Application filed June 18, 191 1. Serial No. 8%,937.

T all 7.17]! am it may concern Be it known that I, HARRY S. DoLBnY, a citizen of the United States, and resident of the city of Providence, in the county of Providence and State of Rhode Island, have invented a certain new and useful Improvement in Fluid-Meters, of .which the following is a specification.

This invention relates to fluid meters of the class provided with a. rate of flow exhibiting device operated by the differences in pressures caused by the flow through the main.

One of the objects of the invention is to provide a -meter of this character, which is of simple and comparatively inexpensive construction, and one which is controlled in its action by a movable member, such as a piston or diaphragm, to which thediilerential pressures are communicated, and to apply means, such as-a pendulum or other suitable device for gradually increasing the resistance to the action otsaid member as the dilierence in the pressures increases to control in a measure the movement of said member. p

A further object of the invention is the provision of exhibiting means in the form of an indicating, integrating or recording instrument arranged to be operated by action of the movable member for showing the rate of flow through the.main.

\Vith these and other objects in view, the ii-ivention consists Off certain novelteaturcs of construction. as will be more particularly pointed out in the appended claims.

In the accompanying drawings: Figure 1- is a side elevation partly in section showing one form'o'l operating mechanism, the two 'cl'iauibcrs being in section connected to a Vcnturi tube shown on arelatively small scale. Fig. 2* is a sectional end elevation oi the mechanism shown in Fig. 1. Fig. 3* is an enlarged perspective view showing the cam and its operating arm. Fig. 4- is a rear side view of the using showing the indicating, integrating and re cording mechanism. Fig. 5 is an enlarged edge view of" the integrating mechanism. Fig. (3 is a. modification showing one form of mechanism operated by me: us of a diaphragm instead of by a piston as illustrated in Fig. 1. Fig. 7, is a detail showing a rod actuated by the piston extending outside of the compartment for coiiperating with a graduated disk. I

Referring now to Fig. 1 of the drawings, 1 and 2 designate two water tight chambers 0r compartments. As herein represented compartment 1 is connected by pipe 3 to the larger section or up stream portion of a. Venturi tube at 5, and compartment 2 by pipe 4 to the contracted portion 6 of the Venturi tube, and by means of these pipes the compartments will be filled with the water or gas flowing through the main of which the Venturi tube forms a part. As is well known, when water or gas flows through the Venturi tube the pressure at the contracted portion becomes less than that in the other portion of the main, and consequently in the arrangement illustrated the pressure in compartment 2 also becomes less than that in compartment 1. The Vet turi tube is, however, only one cit the sev oral well. known in aus of obtaining this ditiercnce in pressures, and my invent-ion not therefore limited to use with a Venturi tube. Between compartments 1 and 2 is 'snown a pipe or cylinder 7 open at each end, and in the cylinder ,7 is a piston 8 arranged for movement in the cylinder under the influence of differences in pressure in the two compartments. Attached to the piston 8 to partake of its motion and extending downwardly into compartment 2, the pie ton rod 9. Suspended in conugartment 2 are the pcndulums 10 supported on knit'e edges 1.1, (Fig. 1). resting upon the sup porting arms 12, (see particularly Fig. The rods of the pcndulums extend above their respective points of support and are connected at their upper ends with the pissten rod 9 by means of the links 1?, or other suitable connections. I prefer to use the two PCJltllllllIDS shown in the drawings. as constituting the best mechanical combination. but one pendulum could be made to perform all necessary functions. As shown in the drawings the piston rod 9 extends above the piston and bears upon. its upper end a cam 16. the purpose of which will be. hereinafter stated. An arm 17 extemlsabove this cam and has a roller 18 at its end resting upon the cam. The arm 17 is rigidly attached to the shaft- 19, Fig. 2, which e2;- tends through a smiling box to the outside of the compartment 1 and attached. to the out-er end of this shaft is an arm which may carry a, pen 21 at its outer end. This pen is arranged to be moved over the surface of the recording disk 22, see Fig. i. in this figure the opposite end of this arm is shown as being provnicd with a pointer :21 adapted to be moved across the face or" a grzuluated fixed plate. 23 to serve as an indicator tor indirating the rate of. lion in the pipe at the time of observation. it an integrator or counter is desired to show the total of the tiow the same may be mounted or. the frame ll and connected to the arm 20 by the link This frame is preferably supported on a knife edge '27 at its lower endproviding an inverted pendulum which may carry the weight of the counter mechanism 23 across the face of the usual driving disk 29. As this exhibitor mechanism is shown. and described in Patent No. 920,025 further description of the same is deemed unnecessary.

Fig 6 illustrates a modification showing one torm of mechanism more particularly adapted for use in measuring gas. The mechanism is arranged to be operated by means of a diaphragm 30, whose upper and lower walls are adapted to move toward and from each other, the same being located within a chamber '32 which latter is connected to the throat portion 6 of the Venturi tube, by mearrs of the pipe 32-3, and the interior of the diaphragm is connected by means of the pipe 39: to the up stream portion. 5 01" said tube. The differences in pressure act upon the diaphragm 30 to ex pand the same and cause it to press against the lever 35. The short end of this lever is supported at 41 while the other end is connected by the link i2 to the rod 3?. The expanding movement of the diaphragm rcccives it gradually increasing resistance by the outward swinging of the pendulum or weights, 36 which tically rcciprocable rod 37. ()n the end of this rod is mounted a cam 38 which communicates motion to the exhibiting means as above described through the shaft iii) and cam arm 40.

The operation of my improved meter is as follows: is the diilcrcuce in pressures in creases by a greater flow through the You turi lube and this dili'ercncc is transmitted through the pipes 3 and i to the compartments l and the piston 8 is pushed downward. and thisunotion is resisted by the pcnduhuns by reason of the upper ends of i tl'icir shanks or rods being pulled toward each other through the links 13, and their resistance is gradually increased as the weights swing outward from their vertical position. If it is desired to obtain only some visual. indication of the tlow through the main, it can be readily done by connecting amid. i=0, see. Fig. 7, or similar deare connected to the vc 4;; maaaoe vice attached to the piston. and extending outside of the con'ipartment 1 to work over a graduated plate 41. Where a record is desired it can be obtainedby a pen moved by the piston, but as the flow through the main is not directly proportional to the diiferences in pressures caused by the How, a fact well known to those acquainted with the art,-some correction in addition to the eiiect of the pendnlums acting upon the piston must lie made in order to obtain an accurate record. As is well known, this correction can be made in the spacing of the rulings upon the paper dial in the ordinary way to the disk .22, but it is frequently desirable to use a planimeter to measure the space incloscd by the line traced by the pen or to have equal rulings upon the dial so that the amount of the How may be approximated, and in such cases it is necessary to interposc mechanism between the piston and the pen to cause the movement of the latter to be directly proportional to the flow in the main. 1 nave shown in the drawings a cam the surface of which is so cut as to ac coniplish this result.

in the device illustrated in the drawing it is to be understood that the disk 22 is rotated by clock work in the usual manner.

I claim:

1. in a meter the combination with means in a main for causing differences of pres sures by a How therethrough, of a movable member actuated by the differential pressures in said pipe, a pendulmnarranged to apply a gradually increasing resistance to a movement of said member in one direction, exhibiting means, a member for operating said exhibiting means, and means operated by said movable member for actuating said operating member in proportion to the square rootoi said diiierential pressures.

2. in a meter the combination. with means in a main for causing differences of pres sures by a low therethrough, ot a movable member actuated by said diticrcnces of pressures, a pendulum for applying it gradually increasing resistance to the movement of said member in one direction, means for operativcly connecting the pendulum with said member. exhibiting means. a movable member for operating said exhibiting means, and a cam surface moved by said movable membc and arranged to act upon said exhibitor operating member to move the same in a predetermined relation to the differential pressures. 4

3. lo a meter the combination With means in a main for causing; differences of pros sures by the How therethrough, of two chambers to which the differences of pressures are communicated, a movable member between said chambers to be acted upon by the pressure of both, a pendulum operatively connected to said member to gradually resist the movement of the latter in one direction, exhibitingmeans, a movable member for operating said exhibiting means, and a cam surface carried by said member arranged to act upon said exhibitor operating member to move the same in proportion to the square root of the difierences of pressures in thetwo chambers.

4. In a meter, the combination with means in a main for causing difi'erences of pressures by the flow therethrough, two chemhers to which the differences of pressures are communicated, a piston acted upon by the pressures of both chambers a pair of pendulums, links for operatively connecting said pendulums to said piston, exhibiting means, a movable member for operating said exhibiting means and a cam surface carried by said movable member arranged to act upon said exhibitor operating member to move the same in a predetermined relation to the diii'erences of pressures in the "two chambers.

5. In a meter, the combination with means in a main for causing differences oi" pressures by the flow therethrough, two chembers to which the differences of pressures are communicated, a. piston communicating with both chambers, a pair of penduiuins pivotally mounted Within one chamber and ranged to applya gradually increasing resistance to the movement oisaid piston in one direction and exhibiting means operated by the movement of said piston.

In testimony whereof Iafiix my signature in presence of two witnesses.

HARRY S. DUI; BY.

Witnesses:

WINTHROP HALLocK, EDWARD E. WILLIAMS. 

